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用于准直系统平行光路中的秒级五角棱镜,在加工中不仅应保证使用角的精度要求,而且对象质及成象深度也应予以足够的重视,否则将影响夹线精度而使其测量误差增大。在过去,我们生产的五角棱镜一直由于成象深度超过±2视度和象质不理想而合格率不高。尽管我们对五角棱镜各面的平面性提出了很高的要求(N=0.3,ΔN=0.1),但仍收效不大。
The second-level pentagonal prism used in parallel optical path of the collimation system should not only ensure the accuracy requirement of the working angle during processing, but also should pay enough attention to the object quality and imaging depth, otherwise it will affect the accuracy of the clamping The error increases. In the past, the pentagonal prisms we produced consistently failed to pass the imaging depth of more than ± 2 degrees of vision and poor image quality. Although we have set very high demands on the planarity of the pentagonal prisms (N = 0.3, ΔN = 0.1), we are still not very successful.